Dilator.



H. JENSEN.

DILATOR.

APPLICATION FILED NOV. 30. 1911.

Patented June 4, 1918.

M f U; JJ

HANS JENSEN, OF KANSAS CITY, MISSOURI, ASSIGNOR TO THE JENSEN-SALSBERY LABORATORIES, INC., OF KANSAS CITY, MISSOURI, A CORPORATION OF MIS- SOURI.

DILATOR.

Application filed November 30, 1917.

To all whom it may concern:

Be it known that I, HANS JENSEN, a citizen of the United States, and a resident of Kansas City, county of Jackson, and State of lWissouri, have invented certain new and useful Improvements in Dilators, of which the following is declared to be a full, clear, and exact description.

This invention relates to dilators of that class employed fo dilating the os uteri, or commonly speaking, the neck of the womb, in barren animals. The primary object of this invention is to provide a dilator which performs its function without forcibly stretching the walls of the canal, whereby operations with this instrument may be performed without danger of tearing or otherwise injuring the walls of the cavity. The invention consists in the several novel features hereinafter fully set forth and claimed.

The invention is clearl illustrated in the accompanying drawing, in which:

Figure 1, is a side elevation of a dilator embodying a simple form of the present invention; Fig. 2, is a cross section taken on line 2-2 of Fig. 4; Fig. 3, is a cross section taken on line 33 of Fig. 4; and Fig. 4, is a side elevation of the head and a fragment of the stem or handle of the instrument. Figs. 2, to 4, are approximately full sized views illustrating the instrument.

Referring to said drawing, the reference numeral 5, designates the head of the instrument, to which is fixedly secured a stem or handle 6, having on its free end, a knob 7. The head 5, is of conical or tapering formation throughout its greater extent, and from its thickest place it preferably tapers back to the stem 6, as at 12. The pointed end of the head 5, is rounded off to afford a blunt end 8.

The face of the tapered or conical portion 9, is corrugated, the corrugations extending lengthwise of the face from the rounded point to the thickest part of the head. In the preferred embodiment of the invention, the grooves 10, and ridges 11, of the corru- Speciflcation of Letters Patent.

Patented June 4:, 1918.

Serial No. 204,581.

gations are approximately the same size, and both the grooves and ridges taper from the large end of thethead to the point. The grooves are continued beyond the largest diameter of the head and terminate in the face of the coned portion 12.

It is to be observed that near the point the grooves and ridges are comparatively small in cross section, gradually increasing in depth, height and width as they approach the large end of the head. The exact shape of these corrugations is not material, however, to this invention broadly considered, as they may vary somewhat from the precise form illustrated in the drawing. 1 Moreover, the relative width of the ridges as compared with the width of the grooves is not material, as the idges may be narrower than the grooves, but in each case it is preferable, if not essential, that the ridges be free from sharp edges or corners to avoid cutting or tearing the walls of the cavity.

In use, the instrument is rotated while being inserted in the canal, thereby causing relaxation of the muscle structures, and consequently dilation of the 0s. The corrugations serve the purpose of relaxing the muscle structures, thereby effecting a dilation.

It is to be observed that with the use of this instrument the danger resulting from excessive stretching is wholly eliminated, but that on the contrary the operation of dilating the neck of the womb may be performed safely.

I claim as new, and desire to secure by Letters Patent:

A dilator comprising a conical head portion, formed with lengthwise extending corrugations on its face, the grooves of which start at the point of the cone and increase in depth from the point to the base of the cone, the ridges of the corrugations radually merging into the grooves at the po1nted end to leave no abrupt portions thereat, substantially as and for the purpose set forth.

HANS JENSEN.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, D. 0." 

